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2000 December Report of the Auditor General of Canada
December 2000 Report—Chapter 30
Exhibit 30.5—Status of Knowledge/Information Gaps on the Interactions Between Atlantic and Pacific Salmon
(Either recently escaped or wild spawned)
|
Area of Concern |
Has it been examined? |
Has it been
demonstrated/ |
What is the potential for impact on wild Pacific stocks? |
|---|---|---|---|
|
Marine |
|||
|
Competition for food |
No |
No |
Unknown |
|
Interference/disruption of migration |
No |
No |
Relatively low risk |
|
Attraction of wild salmon to net-cage sites (both lighted and not lighted) |
No |
No |
Possible interruption of seaward or adult return migration patterns |
|
Freshwater |
|||
|
Interference with spawning (behavioural or egg consumption) |
No |
No |
Risk is anticipated but magnitude is unknown |
|
Pacific salmon eggs dug up by spawning Atlantic salmon |
No |
No |
Risk is anticipated but magnitude is unknown |
|
Competition between juveniles for food and space |
Yes |
Yes |
Potentially high; needs to be evaluated |
|
Habitat displacement in freshwater among juveniles |
Yes - in laboratory |
Yes but appropriate controls lacking |
Risk is anticipated but magnitude is unknown |
Source: Continuing Studies in Science at Simon Fraser University, Salmon Workshop Proceedings - Aquaculture and the Protection of Wild Salmon, July 2000.